From the White House description of the photo: "President Barack Obama sits on the famed Rosa Parks bus at the Henry Ford Museum following an event in Dearborn, Mich., April 18, 2012." (Official White House Photo by Pete Souza)
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This photo is so powerful. The echo of Parks' struggle, and the respect President Obama shows in sitting one row behind her spot brings me to tears each time I look at this. Pete Souza shot an iconic image here.
This shot can be found on the White House Flickr account.